Apparatus for delivering measured quantities of liquid.



J.. J. LASSEN & V. F. HJORT;

APPARATUS FOR DELIVERING MEASURED QUANTITIES 0P LIQUID.

' APPLIOATIONPILBD APB.14, 1910.

1,069,017, Patented July 29, 1913.

UNITED STATES PATENT OFFICE.

JENs .TAoois LAssnN AND VILI-IELM FREDERIK ncroia'r, or LONDON, ENGLAND.

Specification of Letters Patent.

Patented July 29, 1913.

Application filed April 14, 1910. Serial No. 555,349.

delivering liquids of the type wherein twopistons relatively adjustable on a spindle are periodically moved within a casing to discharge a measured quantity of liquid.

The invention is particularly applicable to water softening or purifying plants where measured quantities of liquid such as milk of lime containing solid particles in suspension have to be periodically delivered from a tank.

According to this invention the casing within which the valves are moved is capai ble of adjustment so that when the space between the two valves is varied the dis tance between the admission and discharge ports in the casing can be similarly adjusted, thus permitting variation between wide limits without the movement of the valves and the size of the admission and discharge ports being altered. The axial opening or the one at the upper end of the casing constituting the admission port is closed by a lift valve, positively connected to a piston valve controlling the discharge ports near the lower end of the casing.

One construction of valve in accordance with this invention is illustrated by way of example in the accompanying drawing in central vertical section.

In the construction illustrated the valve is shown as applied to the base of. a tank A from which measured quantities of liquid are to be delivered whenever the valve is actuated. Screwed into the base of the tank A is a bushing B the upper end of which forms a guide for a lift valve C carried by a rod D adapted to be reciprocated in some known manner. The parts are, as usual, so constructed and arranged that the valve C is normally maintained in its closed position being lifted by actuation'of the rod D. The bushing B is internally screw threaded throughout the greater portion of its length and has screwed into it a liner E having openings E formed near its lower end. The liner E together with the discharge ports E. liquid is therefore admitted into the cylinthe bushing B constitutes the casing of a cylindrical chamber for the flange C of the valve C, this valve controlling the upper open end of the cylinder through which admission takes place. Extensions C are formed on the under surface of the valve C which bear against the walls of said chamber and act as guides for the valve 111 its raised position. Mounted on the valve C is a rod or spindle F carrying a piston G also working within the liner E and adapted to control the openings E through which discharge takes place. The position of the piston G relatively to the discharge ports E is such that when the upper valve C is in its raised position the piston G prevents the escape of liquid through the discharge ports, the length of the flange C being equal to the maximum effective length of opening of the discharge ports.

The operation of the valve is as follows:

lVhenthe valve rod D is operated the valve C is raised and places the open end of the cylinder in communication with the tank A; as soon however as the admission port is thus uncovered the piston G has moved upward with the valve C and is in operating position to prevent escape of liquid through A quantity of der determined by the dimensions of the cylinder and the relative positions of the two valves. When the lift valve falls back on to its seat (as shown in the drawing), .the piston G uncovers the discharge ports E but not before the flange C has closed the admission ports. The liquid contained between the two valves is therefore delivered through the openings E, the inclined inner surface of the piston G insuring that complete discharge takes place.

When it is desired to vary the amount of liquid discharged at each operation of the valves, the relative positions of the two valves are adjusted. To this end the spindle F is conveniently screw-threaded so that the piston G can be adjusted to the required position thereon.

Since the amount of liquid delivered from any particular sized cylinder is determined solely by the distance between the two valves,

the relative positions of the discharge ports and lower piston must remain constant. To that end the liner E is screwed in or out of the bushing B so that the ports E are fully open when the upper piston is in the closed position shown. In the example illustrated if the distance between the pistons be increased to the maximum amount and the liner E screwed out to a corresponding eX- tent, the extensions C of the valve C would be deprived of a proper guiding surface and the capacity of the cylindrical space-between the two valves would unintentionally be increased. If desired however when the position of the piston Gr is altered a new liner E of the required length may be inserted. The liner E preferably has a squared portion E on its lower end whereby it may be rotated within the bushing and a locking ring H is conveniently provided to maintain the liner inits adjusted position.

The mechanism employed to actuate the valve rod D may be of any suitable known ty e.

i Vhat we claim as our invention and desire to secure by Letters Patent is 1. In an apparatus for delivering measured quantities of liquid, the combination of a chamber of variable capacity adapted to contain the amount of liquid to be delivered at each operation of the apparatus, and provided with inlet and discharge ports, valves controlling said ports, connections between the valves permitting relative adjustmentthereof to correspond with variations in the capacity of the chamber and insuring that the inlet to the chamber shall be closed bea rodconnecting the two valves, and permitt-ing adjustment of the outlet valve on the rod relative to the inlet valve, guides on the inlet valve'extending into the chamber and cooperating with a side wall thereof, and

means for reciprocating the valves.

ured quantities of liquid,the combination of a casing of variable capacity having-an inlet opening in one end and a discharge opening in its side adjacent the other end, said casing being adapted to contain the entire quantity of liquid to be discharged at a single operation of the apparatus, a valve movable to and from a position to close the inlet opening, a second valve adapted to control the outlet opening and so connected with the inlet valve that said openings can not be simultaneously operative, the connections between the valves permitting relative adjustment thereof to correspond with variations in the capacity of the measuring chamber, and means for actuating the valves. p

In testimony whereof we have signed our names to this specification in the presence o'f two subscribing witnesses.

JENS JACOB LASSEN. VILHELM 'FREDERIK HJORT.

W'itnesses:

GEO. J. B. FRANKLIN, W. J. NORWOOD.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

